Half to john otto



2 Sheets-Sheet 1.

(NoModeL). W. A. GAY.

BOILER PLUE SGRAPER.

Patentad Mar.` 27,

N. Prrcns. Pnawmhagnpyer. was/611mm mc.

2 sheets-@sheet 2;

(No Model.)`

W. A; GAY.

`BOILER PLUB SGRAPBR.

No. 274,756. n Patented 11m27.188s.

' Fig. 3 is a front elevation ot' the device.

' UNITED STATES PATENT OFFICE.'

WILLIAM ALFRED GAY, OF BUFFALO, NEW YORK, ASSIGNOR lOF ONE- HALF TO JOHN OTTO, OF SAME PLAGE.

BoiLi-:hR-FLUE SCRAPER.

SPECIFICATION forming part of Letters Patent No. 274,756, dated March `27', 1883. Application nien January 10,1883. (Nc model.)

To all lwhom 'it may concern:

Be it known that I, WM. ALFRED GAY, of the city of Bulalo, in the county of Erie and State ot New York, have invented new and useful Improvements in Boiler-Flue Scrapers, of which the following is a specification.

This invention relates to an improvementin that class of boiler-flue scrapers vwhich are provided with a number of scraping-blades h avin g the form of circular segments which are adjustable toward and from the axis of thescraper, so that the device can be contracted bei'ore introducing it intothe ue and be expanded in Vthe flue until the scraping-blades bear against the inner` walls of the flue.

The object of my invention is to construct the scraper in such manner that the blades can be readily adjusted and secured in any deof two sheets, Figure 1 is a longitudinal elevation of my improved boiler-flue scraper with the scraper-blades in an expanded position as they are adjusted when in the flue. Fig. 2 is a similar elevation with the scraper-blades contracted. Figs. l.tand 5 are cross-sections in lines 'x w and y y, Fig. 1, respectively. Fig. 6 isasection al elevation of the handle of the scraper. Fig. 7 is a cross-section in line z c, Fig. 6. Fig. 8 is an elevation showing af modified construction of my improved boiler-tlue scraper'. Fig. 9 is a cross-section in line .fr x, Fig. 8.

Like letters of reference refer to like parts r in the several figures.

'which connect the front blades, A, with the rear blades, A', in such manner that `each longitudinal blade B is connected at its front end with one of the blades A and its rear end with one of the blades A. The blades A A' stand at right angles to the blades B.

lC represents a rod whereby the scrapingblades are adjusted toward or from the axis of the device, the rod C being arranged in the axial line ofthe device.

D represents a tube which incl-oses the rod adjusting rod G. The links E are pivoted at their inner ends to the rod C and at their outer ends to the longitudinal blades B'in such manner that the links willl stand in an inclined position when the blades are contracted, or nearest the axis ot' the device, so that upon taking hold ot' the tube D and pulling the rodi() backwardly the links E will tend to approach a position at right angles to the axis of the device, andtherelby move the longitudinal blades B and the segmental blades A A, attached thereto, outwardly or away from the axis of the device.

That portion ofthe rod C to which the links E are attached is preferably made square in cross-section, as represented at O2 in the drawings, to facilitate the attachment ot" the links and other parts thereto.

The two segmental blades which are .located on diametrically opposite sides of the axis ot the device in each of the two series ot' segmental blades A A are arranged in the same plane, and the two pairs of blades in each series arranged in different planes, one slightly behind the other, so that the blades can move past each other as they are adjusted.

F represents arms which are secured to the frontend ot' the tube D, near the rear blades', A', and which extend from the axis of the device outwardly.

f are slots formed -in the arms F, parallel with the four sides of the rectangular portion C2 of the rod G, and in line withl the ,longitudinal scraping-blades B. 'llieslotsfdivide each arm into two jaws, which embrace the adjacentlongitudinal bladeB,and which guide the blade in its movement toward and from the axis of the device as the blades are adj usted.

gis a lug or projection formed on each of the'blades B, so as to bear against the front side ofthe arm F, thereby preventing the blades B from following the backward movement of the central rod, C, when the latter is drawn backwardly for expanding the blades. The rear sides of the arms F bear against the front sides `of the blades A'and thereby prevent the blades from following the forward movementof the central rod, C, when the latter is pushed forwardly for drawing the blades together. By this means the blades are compelled to move outwardly or away from the axis of the device when the rod (l is pulled back, and to move toward the axis of the device when the rod C is pushed forwardly.

H represents guide-plates which are secured to-the rectangular portion C2 of the rod @,between the scraping-blades A A', parallel with the longitudinal blades B, and which project with their outer edges beyond the blades B and the segmental blades A A', attached thereto, when the blades are drawn together, as represented in Fig. 2, so that upon introducing the device in this condition into a flue the scraper will rest upon the projecting edges of the plates H, which latter keep the scrapingblades away from the inner walls of the liuc and prevent the blades from coming in contact with the material adhering to the inner wall ofv the flue and pushing the material farther into the Hue.

i represents a longitudinal groove formed in the outer portion of the rod C, and j represents a key or projection secured in the bore of the tube D and projecting into the groove t', thereby preventing the rod G from turning in the tube, but permitting the rod to move longitudinally in the tube.

la represents a set-screw which works in a threaded opening in the tube D, and bears with its inner end against the rod C, so that upon tightening the screw lo the rod C is secured in the tube and prevented from being displaced by the manipulation of the rod C in removing the material from the flue.

L represents curved arms secured to the front side of the scraping-blades A, and having their forward ends approaching the axis of the device, for the purpose of facilitating the introduction of the scraper into the flue and preventing the blades from being bent or otherwise injured by coming in contact with the ends of the lues. Similar curved arms maybe secured to the rear sides of the blades A', as indicated by dotted lines in Fig. l.

- Upon releasing the set-screw 7s and pushing the rod C forwardly, the scraping-blades are made to approach the axis of the device. The scraper is then introduced into the iue and the rod C pulled back until the scraping-blades etarras comein contact with the walls ofthe flue, when ing the device in the Bue the' longitudinal l blades B detach the material with which they which project into and move in the inclined slots m, as represented in Figs. 8 and 9; and the slotted arms F may also be omitted, and the blades may be connected to the tube D by means of links o,which are pivoted at their inner ends to a collar, P, secured to the tube D, while the outer ends of the links o are pivoted to the blades A', as represented in Figs. 8 and 9.

The parts whereby the scraping-blades are adjusted are very simple in construction and not liable to become clogged by the material which the scraping-blades detach from the lines.

I claim as my inventionl. In a fine-scraper, the combination, with a segmental scraping-blade, of a longitudinal scraping-blade, whereby the interior surface of the fine may be scraped in directions at right IOO angles to each other, substantially as described.

2. The combination, with two series of segmental scraping-blades, AA', and longitudinal connecting scraping-blades B, of mechanism whereby the blades are adjusted. toward and from the axis ofthe device, substantially as set forth.

3. The combination, with two series of segmental scraping-blades, A A', an d longitudinal connecting scraping-blades B, of a central rod, C, a tube, D, inclosing the rod C, and mechansm whereby the blades are connected with the rod C and tube D, substantially as set' IIC IIS

ISO

a longitudinal groove, t', andV a tube, D, inare connected with the rod C and tube D, closing the rod G,aud constructed with a proand the set-screw Ic, whereby the rod is se- 1o jection,j, secured in the tube D andprojectcured in position after being adjusted, subin g into the groove i, substantially as set forth. stantally as set forth.

,7. The combination, with the segmental A WM. ALFRED GAY. scraping-blades A A' and longitudinal con- Witnesses: i meeting-blades B, of the central rod, C, inclos- JNO. J. BONNER,

in g the tube D, mechanism whereby the blades CHAS.'F. GEYER. 

